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Model Forum / Radio Controlled / Land Models / October 2003Pinion gear and motor spur gear contact
When putting the teeth of the pinion gear and the motor together, how tight should the contact be? I had to break my car down to rid the motor of some tiny gravel bits that got in it. After putting it back together, it doesn't have the "roll" it did before after I let off of the throttle. I did take off my rear tires, but when I put them on, I think I put them on a little too tight, which contributed to less roll; however, I loosened them up to get more roll, but now they seem a little too loose. This makes me think that I might have the pinion gear and the motor teeth meshed a little too tight. This is all happening on a brand new T3. Could the too-tight meshing of the gears be the cause? TIA, Hugh Most people say to tighten down the motor with a piece of paper between the gears to get the proper mesh. I simply make mine loose enough to wiggle just a little bit. You definately do not want the gears mashed up against each other. Also I hope you are using the dust cover with your T3. Those fine gears can't handle pebbles and the like.  SignatureJustin Mahn remove Panties to reply > When putting the teeth of the pinion gear and the motor together, how > tight should the contact be? I had to break my car down to rid the motor [quoted text clipped - 9 lines] > TIA, > Hugh Piece of paper, eh? Yep, I think mine might be a bit too tight then. The dust cover was on, so no worries there. Thanks!!! "Justin Mahn remove Panties to reply" I am not wearing my wife's panties today, so my boxer shorts will have to do! LMAO hugh > When putting the teeth of the pinion gear and the motor together, how The large gear is called the "spur" gear, and the small gear (attached directly to the motor output shaft) is called the pinion. Getting the gear mesh right is an art. A popular method is to cut a strip of paper and place it between the gears. Mash the pinion and spur together as closely as possible with the paper in place, then lock them down. Feed the paper out and you should have pretty good gear mesh. Rick R. That is what someone else suggested... thanks though for the great paper idea. And thanks for putting me straight on the gear names. I shall never make that mistake again! Hugh >That is what someone else suggested... thanks though for the great paper >idea. [quoted text clipped - 3 lines] > >Hugh Something you should be aware of, is that most of the time there is variation in clearance, at different points on the spur. Most especially if you run 64 pitch. Which you probably do not. Which is why I do not use the paper method.. If you do, right after you take the paper out, turn the gear back to the area where the paper was. observe the amount of play at that point. Then rotate the gear a few teeth, and check to see that the 'play' is the same as what you observed. Do this every few teeth.... My money says you will find a spot where it binds up.. THAT is the place to put the paper... If you insist on using it. Dan ---------------------------------------------- just because you have one, doesn't mean you have to act like one... > Something you should be aware of, is that most of the time > there is variation in clearance, at different points on the spur. I call this "a broken spur gear". If your spur gear is badly out-of-round, it needs to be replaced. Rick R. There ARE tolerances to plastic spur gears and they CAN be slightly out of round if you get a marginal one. If it causes binding problems, I would definately return it, though. SignatureJustin Mahn remove Panties to e-mail > > Something you should be aware of, is that most of the time > > there is variation in clearance, at different points on the spur. [quoted text clipped - 3 lines] > > Rick R. >> Something you should be aware of, is that most of the time >> there is variation in clearance, at different points on the spur. [quoted text clipped - 3 lines] > >Rick R. Perhaps my stuff is just different than yours. I can take a brand new 64 pitch spur gear, and there is nearly always a difference from the tightest point, to the loosest. Enough so that if you set the clearance perfect, at the loosest point, it will be too tight at the tightest. Which is why I check it the whole 360 degrees. I set the minimum clearance, at the tightest spot... Besides, the point to the original poster was not bad advise to check at more than one point, regardless if the gear is perfect or not... this way, you know. your mileage can vary... Dan ---------------------------------------------- just because you have one, doesn't mean you have to act like one... > Something you should be aware of, is that most of the time > there is variation in clearance, at different points on the spur. [quoted text clipped - 7 lines] > Do this every few teeth.... My money says you will find a spot where it > binds up.. THAT is the place to put the paper... If you insist on using it. Don't use a tiny piece of paper, use a long strip that is at least two times as long as the circumference of the spur gear. If you can pull the strip all the way through end to end without binding then the mesh is not too tight anywhere. At least one of the gears should have an odd number of teeth to even out wear so it is important to check for at least two revolutions of the spur gear to find any tight spots. Ok.. plenty to go on now! Thanks to everyone with the great suggestions and help!! SIDE NOTE: After the paper trick, it worked a ton better. *round of applause* hugh > The large gear is called the "spur" gear, and the small gear (attached > directly to the motor output shaft) is called the pinion. Why do we do this? I work at a company which deals with gearing professionally (and in some depth!) and the terminology is always "pinion and wheel" or "pinion and gear" (or occasionally "input and output" ;-) for the small and large gear respectively (although some of our software uses the convention that the pinion is always the driv_ing_ gear...) Properly, *both* gears are spur gears, as the teeth are straight-cut (as opposed to helical). Not trying to upset the applecart, just curious to know how/why/when we (R/C car people) settled on non-standard terminology. At least bevel pairs are still "crownwheel and pinion" ;-) Jonny > Why do we do this? I work at a company which deals with gearing > professionally (and in some depth!) and the terminology is always "pinion [quoted text clipped - 8 lines] > (R/C car people) settled on non-standard terminology. At least bevel pairs > are still "crownwheel and pinion" ;-) According to www.dictionary.com, a pinion is "A small cogwheel that engages or is engaged by a larger cogwheel or a rack." > "Jonathan Hodgson" <jp_hodgson@eng1neer.com> wrote in message > <<snip>> > According to www.dictionary.com, a pinion is > > "A small cogwheel that engages or is engaged by a larger cogwheel or a > rack." Yeah, but he's asking about the spur gear, not the pinion. Why do "we" (hobbyist) call it a spur when the rest of the industry does not? Bill R. > > "Jonathan Hodgson" <jp_hodgson@eng1neer.com> wrote in message > > <<snip>> [quoted text clipped - 5 lines] > Yeah, but he's asking about the spur gear, not the pinion. Why do "we" > (hobbyist) call it a spur when the rest of the industry does not? Crawl back under your rock, troll. > <<snip>> >>Yeah, but he's asking about the spur gear, not the pinion. Why do "we" >>(hobbyist) call it a spur when the rest of the industry does not? > > Crawl back under your rock, troll. What??? What the hell part of my post defines me as a troll??? I simply clarified the original question! Bill R. > > > "Jonathan Hodgson" <jp_hodgson@eng1neer.com> wrote in message > > > <<snip>> [quoted text clipped - 7 lines] > > Crawl back under your rock, troll. You first. 'spur' and 'pinion' are common in my industry. I design movable bridge machinery (draw, lift & rocker) and i see those words all the time. > > "Jonathan Hodgson" <jp_hodgson@eng1neer.com> wrote in message > > <<snip>> [quoted text clipped - 7 lines] > > Bill R. Almost all RC cars use a small gear from the motor or engine to drive a large gear on the drive train, and they are all called the pinion and spur per manufacturer. There is no need for further classification within the realm of RC cars, so most RCers don't even realize that gears have further classification. BTW both pieces are gears AND wheels, so your terminology seams to be just as nonsensical. SignatureJustin Mahn remove Panties to e-mail > > The large gear is called the "spur" gear, and the small gear (attached > > directly to the motor output shaft) is called the pinion. [quoted text clipped - 13 lines] > > Jonny Ummm, should I use 16 LB paper? 20 LB paper??/ Actually, it should be a sheet (or piece) of loose leaf paper, from a spiral binder or note book. Paper has many different weights and thicknesses. Just trying to help..... Jon > > When putting the teeth of the pinion gear and the motor together, how > [quoted text clipped - 8 lines] > > Rick R. All I do is make sure that if I hold the pinion in place with my fingers and loosely rotate the spur back and forth, there is a little play. Just as long as the spur isn't mashed up against the pinion, I figure its good. --Dan > Ummm, should I use 16 LB paper? 20 LB paper??/ > Actually, it should be a sheet (or piece) of loose leaf paper, from a [quoted text clipped - 14 lines] > > > > Rick R. |
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